The mouth is dry and itchy, which may be related to chronic lipitis, dry syndrome, atrophic lingual inflammation and other factors. 1. Chronic lipitis: it is a common chronic non-specific inflammatory disease of the oral lips. Mostly associated with a variety of long-term chronic persistent stimuli, such as dryness, cold, tobacco and alcohol, lip licking, etc., the local mucosa can appear dry and flaky, oozing and crusting, congestion and edema, etc., recurrent episodes, self-consciousness of the lip swelling, itching, burning pain. 2. Dry syndrome: it is because of the reduction of gland secretion, salivary secretion is reduced, manifested as oral dryness, mucous membrane dryness, skin dryness of a class of syndromes. Clinical symptoms such as dry, itchy and discomfort in the mouth can occur. 3. Atrophic lingual inflammation: also known as glossy tongue, is a chronic inflammation of the filiform papillae, the back of the tongue is smooth and red, can be manifested as tongue dryness, burning pain, dry itching. Dry and itchy mouth may have other causes, should be timely consultation, improve the examination, clear cause and diagnosis, standardized treatment under the guidance of professional physicians.